I managed to fix the issue. I thought all audio files that are in project with 'Decompress On Load' are loaded to memory by default. But I was wrong. Only files used by a scene are loaded into memory.
I have the same issue.
rootClock.localTimeScale = -2;
// Pause while rewinding
rootClock.localTimeScale = 0f;
// Then after a while
Clock time flows as intended, but the the player snaps backs to the position where it were when the rewind started. The player object has a animator, and Timeline with record duration greater than the time when rewind started.
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